Open Pit Gold Mining
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13 سال پیش
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Gold is now primarily found
Gold is now primarily found in very low concentrations. Open pit mines, like the one shown in this video, process tons of rock in order to extract just a few ounces. This process is extremely damaging to the environment. This clip I Segment Produced from History Channel's "How the Earth Was Made" series is being used in the geology curriculum nationwide and abroad. © History Channel
13 سال پیش
در تاریخ 1390/09/19 منتشر شده
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